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Below major mode is a dummy mode just derived from c-mode:

;; a simple major mode, mylang-mode
(define-derived-mode mylang-mode c-mode
  "major mode for editing mylang language code."
  (message "dummy"))

;; add the mode to the `features' list
(provide 'mylang-mode)

But when I switch on this mode by M-x mylang-mode, I always get below warning message:

Warning (irony): Major mode is unknown to Irony, see
`irony-supported-major-modes'.

I try to add below line to init.el but not helpful:

(add-hook 'irony-mode-hook 'irony-cdb-autosetup-compile-options)
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irony-supported-major-modes is the list of major modes known to be compatible with irony, and although your mode extends c-mode irony doesn't know that it's supported. Add your mode to the list with something like (push 'mylang-mode irony-supported-major-modes) and the warning ought to go away.

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